SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c53c4a431cdf617f02fd8ffe7b02d13e826d088ba944f1a449f20e7d60e0b69a' 
  AND token = 'VwdqtHjOuNpOp+AWhqm4SUHqWkQQosKFpt34zMFLaPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}